Particle Technology

hindered settling

Problems 6.9

Question 1.4


The plot the settling curve; i.e. the height of the interface against time graph is shown below. Batch settling curve
It is possible to write a mass balance relating the height (Hf) of a uniformly mixed suspension of one concentration (Cf) to the height (H1) and concentration (C1) of the same mass of solids but mixed to an alternative concentration, as follows:

Batch settling curve

where A is vessel area and the remaining term is the solid density.

Thus, you have been given the settling data for a 3% v/v suspension above which needs to be converted into settling data at the concentration determined in the previous part to be 6.7%; the height (H1) required in the mass balance is (cm):

a) 28.0
b) 9.3
c) 12.6
d) 14.0

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